Loss mechanism of micro-carbon ferromanganese during RH refining

Abstract

It is of great significance to improve the yield of ferroalloy for steelmaking to reduce cost and save energy. In this paper a kind of loss mechanism of micro-carbon ferromanganese which has micro content of carbon during RH refining of interstitial free steel was investigated. The flow field of argon gas in the RH degassing vessel was investigated through numerical simulation. Through force analysis and particle tracking of the micro-carbon ferromanganese, it was found that micro-carbon ferromanganese with size smaller than the critical value of 1.01 millimeters has a large probability to be carried away into the RH vacuum pipeline. The micro-carbon ferromanganese of small particle was easily lost into the vacuum pipe by the upward flow of argon gas. Industrial experiment was conducted and a novel mechanism was confirmed that increasing the vacuum pressure during addition of the micro-carbon ferromanganese could improve the yield greatly.

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References

Deng

Zhu

Deoxidation mechanism of Al-Killed steel during industrial refining process. ISIJ Int. 2014;54(7):1498–1506.

Rick

Engholm

Ferroalloy design, ferroalloy selection and utilization optimization with particular focus on stainless steel materials. J South Afr Inst Min Metall. 2010;110(12):759–765.

Tolymbekov

Akhmetov

Baisanov

et al. Production and use of complex ferroalloys in metallurgy. Steel Trans. 2009;39(5):416–419.

Yin

Sun

Yang

et al. Effect of alloy addition on inclusion evolution in stainless steels. Ironmak Steelmak. 2017;44(2):152–158.

Tokovoi

Khyakkinen

Zorin

et al. Manufacture, study, and use of briquetted ferroalloys for steel deoxidation. Metallurgist. 2015;59(1–2):44–48.

Vishnuh

Sudhakar

Tamilarasu

et al. Experimental analysis of nitrogen as an alloying element in WC9 grade steel. Arch Metall Mater. 2017;62(3):1889–1894.

Van Ende

Guo

Proost

et al. Interfacial reactions between oxygen containing Fe and Al at the onset of liquid Fe deoxidation by al addition. ISIJ Int. 2010;50(11):1552–1559.

Togobitskaya

Piptyuk

Petrov

et al. Prediction of ferroalloy properties for expert evaluation of the efficiency of their use during addition to steel in a ladle furnace unit. Metallurgist. 2019;62(11–12):1115–1122.

Berg

Laux

Johansen S

et al. Flow pattern and alloy dissolution during tapping of steel furnaces. Ironmak Steelmak. 1999;26(2):127–139.

10.

Cwudziński

Numerical simulations and industrial experiments of liquid steel alloying process in one strand slab tundish. Ironmak Steelmak. 2015;42(2):132–138.

11.

Rodríguez-Avila

Morales

Nájera-Bastida

Numerical study of multiphase flow dynamics of plunging jets of liquid steel and trajectories of ferroalloys additions in a ladle during tapping operations. ISIJ Int. 2012;52(5):814–822.

12.

Zhang

Bao

Tang

et al. Effect of size of ferrotitanium on the melting behavior and the yield in the refining of interstitial free steel by RH De-gasser. ISIJ Int. 2018;58(12):2262–2270.

13.

Han

Chu

Mei

et al. Oxide inclusions in ferromanganese and Its influence on the quality of clean steels. J Iron Steel Res Int. 2014;211:23–27.

14.

Singh

Tathavadker

Development of agglomeration process to utilize the ferromanganese fines in steel making process. ISIJ Int. 2011;51(1):59–62.

15.

Kuipers

JAM.

Gas-particle interactions in dense gas-fluidized beds. Chem Eng Sci. 2003;58(3–6):711–718.